Fix typo

Due to manual cherry pick and conflict resolution of
https://osm.etsi.org/gerrit/c/osm/devops/+/12030


an extra 'exit 0' was added.  This change removes it.

Change-Id: Ic5c538ad1df203e50a9a77c79e98e157d77c0d85
Signed-off-by: beierlm <mark.beierl@canonical.com>